Tapping-machine.



N. H. ANDERSON.

TAPPING MACHINE.

APPLICATION man JUNE 18, 1915.

1, 172,336. Patented Feb. 22, 1916.

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TAPPING MACHINE. APPLlCATlON FILED JUNE 18, 1915.

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To all whom it may concern: Be it known that I, N1Ls H. ANDER soN,

a citize'nof the United States, and resident of East Hamptomin thecounty of Mnldlesex and State of Connecticut, have invented certain newand useful Improvements in Tapping-Machines, of which the following is aspecification.

This. invention relates to new and useful lmprovements 1n tappingmachines such as are employed for tapping nuts and other] small parts.

The object of the invention is to produce an improved form of frictiondriven tapping machine where n the spindle normally stands idle, but isengaged and rotated for running the tap into the work by anupwardpressure .of the work against the spindle;

themachine is further constructed and ar-' ranged so that a reversemovement of the spindle is obtained by simply drawing or pulling thework down andoffffrom' the tap; and finally to producea simple, durableand effective form of tapping machine. which can be built and sold atalow cost.

Another object of the device is to arrange the variouselements so thatwhen the feed- ,ing of the work ceases the spindle will be pulleddownward; consequently arrestingthe movement of the spindle in aclockwise direction. By lowering the piece upon which the tappingoperation is 'performed the spindle will be caused to; rotate, in acounter clockwise direction. It will also be understood that by thisarrangement'it will be possible to arrest the vertical position of thespindle in either its extreme upward or in its extreme downwardposition, which 'tion similar characters of reference willbe found 'todesignate like or corresponding parts throughout the several figures andof which v Figure 1 is a side elevation of my im proved form of tappingmachine complete, the spindle and chuck being shown in a raisedposition. Fig. 2 shows'a front elevation, on a slightly reduced scale,of the upper portionlof the machineshown in Figiil, the

shown in Fig; 1, butdrawn upon gthe same scale 'as-Flg, 2. Referring indetail to the characters of which as will be noted includes abase thatThis base further includes an extension 7 that forms a support forthespindle bearing 8. The arm 9 that extends upward fromtheb ase alsoserves as 'a bearing for the upper end of vided with extensions l1-11,that project. V out from itsl'opposite sides to form supports andincludes, sockets 12 that support a yoke the spindle 10. 'This arm 9 isfurther pro- 13 the said yoke being pivotally connected with thesupports by means of pointed and 'alined screws 14 that are securedinthe before mentioned yoke and engage the sockets l2bef0re mentioned.This yoke is of a loop like shapeand serves to carry the driving shaft15 upon which the belt pulley 16 is seing shaft is'journaled'in abearing 17 carriedby'the'bowed portion of the yoke 18, while the innerend portion offthe'shaft is'journaled at'18 in the straight portion ofthespindle.v 'A spring '22 is'connected intermediate of the base andthe'outer portion of V the yoke to counterbalance the weight of theyoke, shaft and-disk in a manner tolnormally retainthe disk ina neutralposition; As will be'noted the belt pulley is mounted upon' the, drivingshaft in line with -the pivotal axis of the yoke so asto leave the yokefree to be tilted. l r

The spindle. 10 which has been "referredto as "being journaledin thearms 7 and 9 is designed to operate in aivertical lane and Y alinementwith the work table 23 arranged beneathit. A suitable chuck 24Liscarried upon the lower end of the spindle and serves to support the taes which operates upon the nut or work 26 supported upon the table.

60 reference marked uponthe drawings 5 rep-$ resents'the'main frame ofthe machine, and

v cured and through which the machine is driven. The outerend portionofthis driv- Specificationof Letters Patent. P a tented 22,1916,Application filed June is, 1915. serial No; 34,541 i chuck and work'table be ng omitted, and "i Fig. 3 shows a plan, V ew of the machine asA friction wheel 27 is mounted upon" .the lower end portion of the shaftand serves to be engaged by-theside face of the disk 19 in a manner todrive thespindle'and its tap in a forward direction. A second friction28 is also mounted upon the upper end portion of the spindle in a way'to be also engaged by the face of thedisk 19 and to be driven therebyman opposite directionfrom .the lower-direction. These frictions maybeadjusted upon the spindle to' and from the axis of the driving shaft toproduce different speeds for the spindle-as maybe required. l5

As will be seen the collar Qlfas well as the two frictions 27 and 28 aresecured to thespindle and not :only rotate but move togetherlongitudinally. It will also be apparent that the? longitudinal movementof the spindle andcollar effects the driving shaft and tilts the disk sothat but one of the frictions can be engaged with the disk at the samemoment. The face of this disk 3 may be shifted so as to engage either ofthe 5 frictionsor brought directly parallel to the spindle in way toform a neutralor unengaged position. v V

' To thebase of the frame is secured a bracket 29 which is provided witharms 3030 that extend .outbeneath the spindle and are provided withholes to accommodate 7 the round shank 31 of the workcarrying table 2-3.Theadjustable collar 32 upon the shank of thetable serves to engage theupper arm 30 of the bracket 29 and thus limit.

the upward movement of the work table.-

Injthe operation of my novel form. of tappingmachine the operator wouldplace the work, as for instance anut 26, under the holder 33 and uponthe table. Any suitable formof clamp or holder may be employed on;

the tableto support the work. Thisinsures the alinement of the work withand beneath. the tap carried by the chuck. The table t0- gether with thework would then be raised andthe latter brought into engagement with theendof the tap. 7 Further pressure of the work against the tap wouldraise the spindle to the position indicated in-Fig. 1 thereby I shiftingthe angle of the driving shaft .and

tiltingthe face of the disk so that the latter would be brought upsnugly against the lower fricti0n27. This insures the driving of thespindlein a forward direction and likewise its tapdowninto the work in;a,

been driven thereby quickly running the tap.

outv of the nut. andfreeing the latter.

From the foregoing it will be seen that,

the device is automatic in its action and that noshi'ftingof levers,belts or clutchesare re quired. The operator simply presses the workagainst the cutting ,tool jto' effect ithe threading in the firstinstance and; then draws the work away whencompleted which act tends toreverse therotation of the spin dle and runs the tap out of: the work.

Having thusdescribed my invention what I claim and desire tosecureby'Letters Pate ent is 1., In a tapping inachine,the combination 1 of aframe, a work table,--a yoke mountedf upon the frame, a drivingshaftcarriedin the yoke, a disk carried by the driving shaft, alongitudinally movableispindle carriedin the frame, a pair of frictionmembers mount-3 ed on the spindle 'to engage, the face of the; diskconnection between the spindle and?" shaft to cause the engagement. anddisengagement of the said disk andfrict'ionmenr ber.

In a tappingmachine, the combination v I of a frame, a work table, ayoke pivotedly mounted upon the frame, a driving shaft? carried in theyoke, a disk carried by the 1 driving shaft, a longitudinally movable;

spindle, carried in the frame,a pair of friction members mounted on. thespindle one I to engage the disk above its axis and Qthe f othertoengage the diski below. its axis Iconnecti'onbetween; the spindle andshaft to cause-the engagement and disengagement:

of the said disk and frietionmemben.

3. In a tapping'm achine, the combination of a frame, a longitudinallymovable spindle carried in the frame, a yokepivotedly shaft pivotallymounted in: the frame. and i engaging; the spindle 1 in a manner robetilted thereby, a disk .mounted on the shaft,

a pair of friction members mounted on the spindle to engage thefaceofthe disk.

4. In a tapping machine, thecombination of a frame, a longitudinallymovable spin-- dle carried in the frame, .a. yoke pivotedly mounted uponthe .frame, a driving shaft? 7 carried. in. the yoke,- and imeans toengage the spindle'to rock theshaft, a'disk carried by the. drivingshaft, ,a :.pair of friction a members mounted on :the spindle, one, toengage the disk above its aXis and the other to engage the disk belowits axis.

5. In a tapping machine, the combination;

of a frame, a longitudinally movable spindle carried in the frame, apivotally mounted driving shaft arranged at a right angleflto the spndle, means to engage the spindle fto rock theshaft, a disk carried bythe shaft,

a pair of frictionmembers mounted on the spindle to. engage; the face ofthe disk by" the tilting, of the-shaft;

6. In a tapping-machine, the combination of a :frame, a pivotally'mounted drivingr shaft, a: disk carriedbyj the dIlVZlIlg; shaft;

a longitudinally movable spindle arranged at a right angle to thedriving shaft and connected therewith to tilt the same, a pair offriction members mounted on the spindle to engagethe disk above andbelow said connection of spindle and shaft.

7; In a tapping machine, the combination of a frame, a pivotally mounteddriving shaft, a longitudinally movable spindle operatively connected tothe said driving shaft to tilt the latter, driving connections betweenthe shaft and spindle that are made effective by the tilting of theshaft, a movable Work table mounted in the frame to effect thelongitudinal movement of the spindle.

8. In a tapping machine, the combination of a frame, a work table, alongitudinally movable tool carrying spindle, a work table in alinementwith the spindle and movable to and from the same, a driving shaftoperatably connected with the spindle, a disk carried by the drivingshaft, a pair of friction members mounted on the spindle to engage theface of the disk by the longitudinal movement of the table and spindle.

9. In a tapping machine, the combination of a frame, a yoke pivotedlymounted upon the frame, a driving shaft carried in the yoke, a drivingpulley mounted upon the shaft between and in alinement with the pivotalsupports of the yoke, a disk carried by the driving shaft, alongitudinally movable spindle carried in the frame, a pair of frictionmembers mounted on the spindle to engage the disk.

10. In a tapping machine, the combination of a frame, a longitudinallymovable spindle carried in the frame, a sleeve upon the spindle, arotary driving shaft pivotally mounted in the frame and engaging thesleeve of the pindle, a pair of friction members mounted on the spindleto engage the disk, and means to move the spindle longitudinally to tiltthe shaft and engage the friction members.

11. The combination of a frame, a spindle, a pivotally mounted drivingshaft, a

driven member mounted on said shaft, a

pair of friction members mounted on saidspindle, operative connectionbetween said shaft and said spindle to effect alternate driving 1connection between said driven;

member and either of the friction members to effect arotation of thespindle in either direction.

from the axis of the disk, one to engage the disk above its axis and theother to engage the disk below its axis, and means to effect theengagement of either of said friction members within the disk by alongitudinal movement of the spindle.

13. In a tapping machine,the combination of a frame, a tool carryingspindle, a tiltable driving shaft, a disk carried by the driving shaft,a pair of friction members mounted on the spindle, means to cause thedisk to engage either of the friction members by the operation of thespindle in a forward and backward direction.

14. In a tapping machine, the combination of a frame, a tool carryingspindle, a tiltable drivingshaft, a disk carried by the driving shaft, apair of friction members mounted on the spindle, means to normallyretain the disk out of engagement with the said friction members,connections with the spindle to cause the disk to engage either of thefriction members and to operate the I spindle in a forward and backwarddirection.

Signed at Bridgeport, in the county of Fairfield and State ofConnecticut this 27th day of May, A. D., 1915.

- NILS H. ANDERSON. W'itnesses:

C. M. NEWMAN,

RUTH M. W. KOGER.

Copies of this patent may be obtained for five .cents each, byaddressing the Commissioner of Patents,

- Washington, D. G.

